Actually there is everything wrong with eugenics. It assumes we can know the value of a person according to some kind of quantifiable test. It assumes we can engineer better persons. There is nothing wrong with eugenics only if one is enough of a fool to believe that better breeding makes better people- as better breeding makes better horses. It's a bunch of crap. There are good people who come from horrible backgrounds and horrible people that come from good backgrounds.
The bottom line is there is no quantifying the value or dignity of a human life. Once you do we are all ranked on somebody's scale of eugenic dignity. It is a short step to the elimination of inferiors. Pray that you never end up on the wrong side of somebodies list of what qualifies a worthy human person. It's not all that uncommon as the slaughterhouse that was the 20th Century proved.